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  • Title: Chirped periodically poled lithium-niobate-on-insulator micro-waveguides for broadband second-harmonic generation.
    Author: Wang J, Xue X, Qiu J, Tang Y, Ye R, Zhang Y, Huang Y, Li H, Liu S, Zheng Y, Chen X.
    Journal: Opt Lett; 2024 Oct 01; 49(19):5348-5351. PubMed ID: 39352953.
    Abstract:
    Periodically poled lithium niobate (LN) waveguides based on quasi-phase matching schemes, benefiting from their high nonlinear coefficient (d33) and strong optical confinement, are widely employed for implementing efficient second-harmonic generation (SHG). Here, we report broadband SHG in z-cut chirped periodically poled lithium-niobate-on-insulator (CPPLNOI) ridge micro-waveguides. Nearly 90-nm-wide SHG at the telecom band is achieved, along with an averaged normalized efficiency of 7.5%/(W·cm2). We also demonstrate simultaneous generation of second as well as cascaded third and fourth harmonics under direct pumping of femtosecond pulses. This work would benefit applications for frequency conversion of a wideband coherent light source.
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